Seal structure for spool-type switching valve, and said spool-type switching valve

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 12025228
APP PUB NO 20210215252A1
SERIAL NO

17262473

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Importance

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Abstract

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A sealing structure is configured in the following manner. When a packing having a pair of sealing portions formed at opposite edge portions of the outer peripheral surface thereof is installed in a land portion of a spool, the outside diameter of the packing is made smaller than the diameter of a slide surface of a spool hole. In a state in which the outer periphery of the land portion opposes the slide surface and a pressurized fluid is supplied from a gas supply channel to the first space of first and second spaces that are partitioned by the land portion, the edge portion of the packing positioned near the first space is elastically elongated in a radial direction due to pressure of the pressurized fluid and thereby narrows a gap formed between the first sealing portion and the slide surface of the spool hole or abuts the slide surface.

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Patent Owner(s)

Patent OwnerAddress
SMC CORPORATION14-1 SOTOKANDA 4-CHOME CHIYODA-KU TOKYO 1010021 ?1010021

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawakami, Masahiko Moriya, JP 31 545
Kudo, Masayuki Joso, JP 36 372
Miyazoe, Shinji Moriya, JP 137 1532
Noguchi, Kazuhiro Tsukubamirai, JP 100 1121
Umeda, Kazuhiro Noda, JP 44 101

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